X-ray properties of the Sun and some compact objects of our Galaxy

TL;DR

This thesis investigates the X-ray characteristics of the Sun and select compact objects like black holes, utilizing developed space instruments to analyze solar flares, gamma-ray bursts, and black hole outbursts.

Contribution

It introduces the development and characterization of the RT-2 X-ray instruments and provides observational analysis of solar and black hole X-ray phenomena.

Findings

Characterization of CZT and CMOS detectors for X-ray observations

Observational results of solar flares and gamma-ray bursts

Spectral and timing analysis of black hole outbursts

Abstract

In the Thesis, I study the X-ray properties of the two major stages of the life cycle of the stars: one is the normal life of a lighter mass star (Sun) and another is the collapsed state (black hole) of a star (black hole candidates GRO J1655-40, GX 339-4 and GRBs). I am lucky to be a team member for developing X-ray solar space instruments RT-2 (S, G and CZT) which observed both the Sun and Gamma-Ray Bursts (GRBs) from space. A part of my Thesis contains development of RT-2 instruments, characterization of CZT & CMOS imaging detectors (used in RT-2/CZT instrument), some observational results of solar flares and GRBs. My Thesis also contains the detailed timing & spectral properties of the 2005 outburst of the well known Galactic black hole candidate GRO J1655-40 and initial rising phase of 2010 outburst of the transient Galactic stellar mass black hole candidate GX 339-4.